SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '891b7ed30b324c46d4e3860b90a9337c3c1ef003051832bd6d91857f1c383aaa' 
  AND token = 'chpOlBXhyiTHzgIuRPjZPFyzC/dj6pV94wh4YUh6ar4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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