Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a50b18f586c8105f9496790340367efc210ab362d4c5c7a7611b6255f6793d' 
  AND token = 'pJ4aMHsHMsTUpPLv0tKbXAbr2w0VTrt1s1iGRXKSXuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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