Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f73d6bd0544066681d612bebba9e2238021ce6dcf2138c0ecadbac18449b0f' 
  AND token = 'SFtIKepjDLKQpwy6OmfcNn66L7t0idNlWFDsvE2s99o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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