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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65cb04728d7fbda69bd11b15261411b4f4da1f3eac5bf75f29ba25a10be974eb' 
  AND token = 'qQDvCslE3LyfCKnpqSv103xFXofDEcZMhHJ9NR/J7ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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