Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a5c1f95e2aaedcb2308fcf06c51da9deb0b4dcac5618af6d67e45962d971a9' 
  AND token = 'v4DbO3jfkRBNAb3SLHr9W7U8qQ78OgbzVlDHd7JFxIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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