Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16095c081b8606a12b0773d3c502ef3f54ff8833c783aef6bd067740cb4ed5c3' 
  AND token = 'YXMpdcoU1bK+Pb104g5+ufeF4mfZoO0NhVHaB3mvVcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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