Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc189307862e6b27cacda5c4e16d94705f0c0e3b819f7d216ae1557af9e8203' 
  AND token = '/vlynJSavBdsBNxhRTJqvLTF1JdpnFMDtvfz7nRYAcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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