Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f501f8d5d56e79141eeef012e6055f5dad2a45d9dca676ff8b836a57cee1256' 
  AND token = 'SpUtSsgCRn0IKR9YRDHuF03LSKz4qJKqsbHBIT42u6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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