Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e926a8bc8618ace40908d9d78a5eff9597b38fda5748015ef0325e4b7469eeb7' 
  AND token = 'sI5nNmS6NR2T6Dp6vVIs8OgAWZfy0SNNxvUaTwDtxrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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