Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d7588506fcce0b53eba123e46ca2aa90ea697a8bc1fccb3ba20e1505ede072' 
  AND token = 'PxGmbzD1F/fzgzY2LRB3Pud9BVg3UWjQr9gRqeOG7i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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