Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff1f97b6aeff4ea370a89d4d01293f8a9010308bcc5fa61663e9d87b21d5944' 
  AND token = 'SQmaumbzdPGBHem4h9mYIvLccUAPgG3go/5rPrtBG6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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