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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'da2da879c8e52b9a3d3ecea5d77c1fd0baacd4b9b24212793464e65b95889c45' 
  AND token = 'DVCw7fU6z5o5PtLlhg4s/oh12rtyy0TkrAYJ8DUViEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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