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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4b5eca5ef95f85fd26324cd37f5d07583fdae9f4df8620ee34982e85963e3455' 
  AND token = 'kaX6///LbIICHlat1ooJIu6Ww7ObMh8TQ8dsPkUZ5Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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