Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b8ebbca8b06caee26d68291151bc8cc8ab9d78bdd8b675133cf17d92f11d81' 
  AND token = 'QOu5HdUyA6Lh4fuA1qEtrsLfSZsLcMx10Hry1YBkJ5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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