Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19b7995854104cdf0499a9c6378fa9c760a0b908f31747fad5898e48ce720d5' 
  AND token = 'rTVJGE/M3Xou38hMdrwVMpGLJg11jmJBIoYj5WcFj9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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