Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6418bf645577537d07ee836cc8984e04f7a7d018780065f1f326a3faf8139553' 
  AND token = 'EBjKiwHkwuJyOxycxNu7Gi8bBoHDrtse8euXLWT+EcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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