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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4fe9efa28eba9f08b42e4f83b9da6376ef96f62d58685ac3444336d6d8203b7f' 
  AND token = 'Wop2xWh3e2j4y/BwxZhdo5r8aWCfGOq28tQnVJ4H8Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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