Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6d2bdfba3bb7671bf3dc7ee3cbb5ccf5b7813a14b0ba72a06ead7fbb4f3e8f' 
  AND token = 'UT+J4GbsHu7wkjMtBgYlZFm6t1Qk33j2jFdkDef8aOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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