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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0eb7c1fc421f344eda49c3b19de90d5d0a0f846b8a6c68111a6dbc39e67c1aae' 
  AND token = 'ZCU45Plk5PS8YsUXjVp2NUT9E8fYT4gkmlA1wOpLRUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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