Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66a5e710e17cf6a08ec167eae900992bff6d40cdff3f949fae87775afae6dfd' 
  AND token = 'P+iM1tikYweQhalSusB8b3H00WFg7nHWF0YS3sBXuEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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