Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2e47bd0cdf59d6f6c581064a3ad0f56d639dcbcb704899bebfab5c0f85187d' 
  AND token = 'LyYSYUgEKPgRJrhJNdrNlEtT09C5H4dlJSWi+s/yMCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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