Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c69af9187b02be5bad2eb004b79c3f52d08db9dfee4a6cf792aab17dc4020c' 
  AND token = 'olxL3vRLD737wPbMmGPiJtUxqEcj+wbZpNbkyjAuZa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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