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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bc320a34ae0ae5cb900e5ba8f33bf4063d036dc59c62e6d45be646fd314f1d' 
  AND token = 'PqUE3M4wl7HMufq6PU8W4jeaESO78qGkDVZevzrdwQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}