Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97e21f79517fad4bb6a224bce8c904305bb2042a497accab722dc30b869a97e' 
  AND token = 'CJsV5tayd2fA+5HAkEXQnjlWDUkkamdCEt0B8VznejY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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