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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6ddb04e90da9de1357e3cdcd6adf200f0251ff8d1316989316fe3b3203bae03f' 
  AND token = 'Nwq6Jt37OmEM9IbEJpD31t8CzgXiP99LDzuC/jMW+PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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