SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba072104ff6a8c9afbe033a4a22d07dc6f9c6947eb676f7043b1b3a039f711e8' 
  AND token = 'ezxErJyszVUNaHbVYotTGWxwOriBtGZsB+UWV49lFto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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