Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5790c6477a463ada7fda2d9427425513a7f9919f38f1fd83ee3e77edb0352b' 
  AND token = 'OCv8IRdIjTR2KmatdEPjFhj1C6UNnPa0Xyb2DH2vWr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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