Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438dfe2c0d4593c9e976ff65e80e0cd5492ae83262fab080d36030e6b33e84a0' 
  AND token = 'Z+So+gvvldm73ZmFMPmyE+zHK0oDTqgVm6uBpFf4zl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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