SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '836416124eba42b75386a5e170ac50371e5c020cdfd3c076c241d42e9ff5d234' 
  AND token = 'oCVyY3/JoNJJN68j9R0zkU2Ix/9mUyYwL/RLC2zOGpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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