Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43620ca97f8156c7efdb0c11b4e28f5699ed831fbf423d1a79c4bf50e708f7ad' 
  AND token = 'reiDahoGI2mfSe5WjQ6ndyM9qryUng8scFKfnQoF2sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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