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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb1c306e2069122ac1c40f7c0d8c67c6d3071e52902b454d7c21a75f7baa02d6' 
  AND token = 'rEv3AMt+koop7vXhjC2SKxX9nndivSzSeN1NqKFyY0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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