SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '73359ba2a3e45b2b8166eb1e1214bf1e8d2fd0606b09d5de98d47da8d6058dc5' 
  AND token = '08K7DYjehXq++rMzHkP3zowCKM3YV/d6elRfPdELj7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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