Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e7b6b22756bb4b461a8d63c8d2b1792a30deb778b71bd9558ba1ffe6d50d449a' 
  AND token = 'nhJESv11eLWSXzOeRVNyClIGj72SsgKSsn72WwGR57s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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