Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2feadff7b7b8ca9930d46a41943318f6043ee48f0c22ccff9376b1cb43b398' 
  AND token = 'eIhVDs9fdghcdZSMnecCp/jPFmFFmrQ3g51VnREbqPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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