Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575c88e8c3fcd500485c97b319397ba3985dbf813507d2ecfe73e2b7f0952b4f' 
  AND token = 'ujXNxp7GYZT7aON3YXTw9YkGpRpSd+vypLF67A8+noc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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