Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd0a9a9ba9680e34c1331e140b23a782b802e6b2decea08c715d38667b0d1df' 
  AND token = '4uUHDmZIGu0eYz0QxNhsf8Mum9J+sap4PwcIbFycM+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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