Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff54d6a7fc3b6689dc335dfbb7b46ac4d8222e7e2488eb20c501471a27e83da' 
  AND token = 'j8UjQiyXeac3I5vd1htOecZVZN+O6hBz1eHz1XtZkxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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