SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9e766f63b36e99d040ef6194df7c7129c78e661c86aae160b97df5ae2065bb5a' 
  AND token = 'shZVLdUCWGt3je1mqBIi/y8edbgBR7dwr3CkPmlY2Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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