Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684ca8bcf880bb3488f895675051f3db5b0446872ea958b2af0019b71d2245e0' 
  AND token = 'h0czhpWMZtl/uUzCts4hxMZO550kdA6vg6jdx910CmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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