Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bfbcdfe50a45c3f765a337b5e899d1a46f55f0d59ef19c58f0b2df4ed9099a5' 
  AND token = 'JsLq9rmui8RNSjNXLsoNCijzPLT1aqo1C3E0hOv9y38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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