Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcc18bf4a8e6680113a66c982f2564a9c3e26ba5d5007897c5b6f6da3437359' 
  AND token = 'C0JTWp5z/RYfQNJY9MXJ5fEgqQEL3PMkC+vQREFuy74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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