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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '273f00b08f640acb2896d8a4ddeef2bd8cd2279d5e4640c3f8619c86d07921b9' 
  AND token = 'G3F/yQ0HxiFjeIP0tDyEw7jfj/Lfp7ZsW8c4SNyfCRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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