Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617c045b5de5b74cba611837045a2894a2be9f945c22c6ee486b0a87f2af4524' 
  AND token = 'MblP6tcWMW2gvhK/+Q3kG+aWP6QHDMEPzcFvzWqckPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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