Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ac369e4c18c76a33caf912cdd26f47698de8cc88f0f63de1e4387778beffe6' 
  AND token = 'lX9/0v3OBAcqkIIOrAVfcJ3YGvL6mgj9FMs/k7NfpTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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