Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e521002e1de140b136f7e914eec99deb9c685ff04c5de2288fc7367a6ee04858' 
  AND token = 'VPMlrSUAQ8qFguXfgE5UWIA0hZ2sWlGxnSm5u8royG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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