Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d700fac91aec1dc490b620776231dec9fcdebd053abeabc2373b6842d7a694' 
  AND token = 'Fc8ATAFEL34Mb+miKgBA5QKC6mBL/ZwSrB4GgxpjaZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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