Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6eecd6cbc8a123f303c514049f1fce8794ec535252fe1ab6f1188ea3e1d4d0b' 
  AND token = '7OC7eSXfnG3PbC9EfsxyCtrDwH5t5/QSt56oFTY/hN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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