Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74bbec8556465ec7ecc38a22aa386eb2e0ec388400795047df55100efa2dcfa' 
  AND token = '3ArHntqSyrCKVzlFbYsY9u1kwWnlTsIyuatAIAaViEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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