Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80eeb236ce7c991792002b94bad1eddd5c1ac8cbaf4b423225cf94ec981ef51a' 
  AND token = 'jhmNHGEok3DUXqX9Rd4fZ5ZSLTjJwSRx8+qyBNRYoDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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