Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd197e1f2933d7956700ce22453d2082c9125f11f61e939092e392e1a3775e35c' 
  AND token = 'x0LlPzRogjTh6GTNHjRQnbXnZI8JzAkRPSf1lqdrliI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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