Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a837c19ad74588aa8dbba91918d2c4c97bb61876ced5799e4bf0b018919b8686' 
  AND token = 'LhBoX03rPoQq5cpX+4phPkEb1cNIGNVCbCNJYX8Kqjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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