Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b757a0aa8e3a408adafec538dde752fb50f2c507255c215bdb69174a54d41b25' 
  AND token = 'X4VrSc+qGqF9LxTxssbA05ORUAWqkRbhaK9WqJbbWI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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