SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2864997bc08d190bbdad26561ad3a6d25e41b0a227715eba834f8b56b95113b3' 
  AND token = 'FWjoWO/t6Os2+jS0ifY/mpvLTJkGStK9Xdyzmy0uiN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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