SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d7a8c47c613d62eba4279d00ffa1b11189a03f3de56c6972a832fa14528bc93' 
  AND token = '+noixPE1xZUj3eUaUlMBf0YE5GOX3JXlW4L4xvby7/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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