Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8437f060f5b3af45d2211b3d61c8d3aaf26ef2eaad062bd77822e9f1f0d46c' 
  AND token = 'M87Wr/8UgbA/Rzr5PsD2KW6YsdF8zPvOWIA5V+ZQ+T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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