Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21917c6bb2553ce10493534b227fbdf4ee69d66f26299f522edf10a649b64f1' 
  AND token = '7gR4nD6F1vMvIhD3x7+qSRFWi1N3WKsETrnI6asp1/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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