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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4f60a36bf0cb2abf26fafb1310b7c7bcad8d08dadcc04eaf09c1ddcff133b2f4' 
  AND token = '9sFv7lWg3AHxfNDJrPK4aUoRZzJWxj/mKMk7Y0RQR5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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