Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ffda41a4b09419c4441def08b6c6bf149dd162b6ecd454ca3fd35af5c3295f' 
  AND token = 'DXtghDMkCCEVgzPuMpMUBecP6ySmFPKuo0CxANehBkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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