Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb958c4460760a129c22c560c6186cbb0ba92c57a30c50b60ff7976aee34e52' 
  AND token = '556zLOu3qN/tLsCe4ppkTmv7d64B2sGw+Mfap3yt/FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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