Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a2d8a2d58e633c00937774824cfe87b8d7ae32112ae0a64e0b4e6491265b1c' 
  AND token = 'QkWpTKL9OnPEhE1Cqbg/ibwOQ7UiUPZrTOBEN743XF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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