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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b63ca816b7e85c488a201addaf4bda11d59759c1a7c8109454b236af6ab74cc1' 
  AND token = 'Ar2b72qnyb8qXcTscxLerMt+j5HD96l4N8ASsvHelFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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