Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0dc83cb4fe722096bfc57bb4a66b5d5c55914bdc64e2bcece6d5ac25a19f6e6' 
  AND token = 'AjEf1uT6k7RVrKf5l/oki72sAW+F4wwsvmawOrmoW/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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