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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dccae1bd9b71790923ef9be10b7bd31dd75f99c1b98904584a8a610b6f31d73c' 
  AND token = 'JM8CchUxVleTaOfIOZI5p7au/KIliNEFJ5NAmn4+WCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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