Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195860335ce2d55493062884a4547982bf33ccda1571ae775c7b7de2c883f37b' 
  AND token = 'xk+RskjpNblkn1pP6RCFoCfuKA4g/3ORokt3nqS7kHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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