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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7e9cfe96b86f4b9a3a3ea6f81251db172068e737852f7e3470558cf98b688e5e' 
  AND token = 'IjcFxuPh6I97M68stY46lXGrrslxnUMjhRh0jbJ/Kzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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