Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fec85b43e03e5929da4530bba99c2a30741032da33630e70d62764ecc181f91' 
  AND token = 'oT+YetzyP7QTGg2rDIN3fzscJ/dlIsd7oPjQyC48M7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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