Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406ce7a53c1125e4767870f49dbb453a534fe3cd273c2966473d9424429270f4' 
  AND token = 'Y/iwM5GIfQ5Qo5+Y+W1v7ZRDbJodRBY9t/X9dMrBSyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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