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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6dfc6ef75910477d47077eda37c78d20a08cf56e1290974881707cf4696c1e9b' 
  AND token = 'Qk71QAYhlDmJolAqka5Pinc8K3ZTNc+MUOE8lDCBYtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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