Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282da61be30216c1678d3aa4a862308387d6545d11e50d612053177d8564ceab' 
  AND token = 'nkH7XAp+TVo5ical/7v30pkZqIGdsBJgcO32Bzusae8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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