SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e9f47d19262b23e4ad227302b9946d0870a6aafac1bdeee45702fb5de1a0fd4c' 
  AND token = '/tVRVepRlLGZmgYKNONHn/QpQVYdW2RJ1f5GCYc3xhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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