Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157adcab96eb850e894505e6688f1abada1b968f78dd4d015a6a7a9367cbad6e' 
  AND token = 'X+u303VIKjdBG9XrEDzMElYhUM5C9R/MhIb1NTWzRWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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