Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ff6c4c659bf9760a2e65ce8d8d3dc8a2305b0b2976d77722c5694d7fdaa9a0' 
  AND token = 'et/m9NI5pfE3CCqi/MhKKVbnJQdAk4a0weILXIcZscQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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