SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '576bde7d0dc18ad01f9f47398e35d74a4d4694ac9d1f12949b85efa7ef5528b0' 
  AND token = 'qfaUyoRla62dAfZL/oBcJDJxIWEwKvNim/SguVYQ7k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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