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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a04534553f4de6a4c44b03c6d45141f586162179ab9d960ad86177d94ea8a43c' 
  AND token = 'DhaDf9aOuKGxJOVVdxwPesjlI9l4FRgQyft8tF0rIjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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