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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9117139bdadbf655ef23dff1240ba63f6bba11612dd603e98e3c3f942ffa0db5' 
  AND token = 'AZOt9uiMaVcrt9E6+sod05U/mzwyvwiGmG6mt6SohPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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