Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4dab5a45b96188a148668cfa69a4a22693376f4d994077633247b03572cb94' 
  AND token = 'gEldH1qIMN2VmnDpq00njLQBdRxNbZMA6CBN6s13+hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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