SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7151c3df86efa4fbc9ea12a8ccb3dd1f969d46a1c8a8653357aa47cfb6ea9e0d' 
  AND token = 'PeB0WVx5KROq2SxdY/OMBnAllbJCTLAXy8tf5VlGheg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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