Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a6ba65edd2cebcf18e695c3b5f73959b2a3803af5b33b7ae416fee6882a0f4' 
  AND token = 'qlzSAMCrlfsXHOgzQxkycK9a/v9Yem01VTNDLnY0f7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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