Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1f55fd65d80540dac7e6c50567a22bb302abc9545f074cf9d5fcfa9f4e36dd' 
  AND token = 'awarIz/AAQ4+YZCfFpCqVn9tcNDeyT037cY0xOUDjKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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