Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c4efb81c0990456d583cbeb850add9888d0e1ca474b4f35cf0eaab9fa0ad69' 
  AND token = 'f3qCOBZHq8xGbG8iIcyGMR3erucNr8GnRe5Nev+ZpE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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