Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a920b811320d666f75709f8f759b882bb3daa9a6a704be316f4b9c102ca2cd43' 
  AND token = 'jJU7oxdDmq+xoPejQTZRL4Ue10LtvF1BWJv57uitfak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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