Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4be13c53dba16678c15a27d4a8c87dbc7a9803cdc60823946776a113967ff44' 
  AND token = 'iAKTi/bn6Ekh1GRHbCXKvWFiBQR30qRXtmFo0tIcQvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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