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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710a84d858c4ab9ff6143ae789d7415bf3f9d5c9a39b2693e6dfa8ab84595624' 
  AND token = 'KyypS1q65O8rT9LPrEXaKvmzXruAwZW/OWXsq1gPo8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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