Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b38a1299e189f2b4f2722415304b45af4ab72892f92d34c48e7bd2ac8c888b9' 
  AND token = 'b8aHi6TrakUbAP9UHjh5nLY5w6r4Jn6Wz3mOiRSvzk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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