Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f0571522375acad481ba0d8963ab0500c8475e60a1e0f6f0a4deababa18d54' 
  AND token = 'Uv1ZHZGxzct9uJ5F15s1Z0c5AaP2bm8DG/IjUuBR5yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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