Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d3c44d5ae3a500828247a384dcd315a1a981256b572e201accbacff07dca39' 
  AND token = '1Tb6extGzZkJcNjp0Im6x0wQ1K0yYduJmrDMSQG0P7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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