Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc29598a4d0642935633c134bc88899b8e386f70783802b9d0f3d9b0b927583' 
  AND token = '6cXaf6Pvdn2Jii4D3r4LTtZkb/9fJkvI22w7BS2KTFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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