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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '78894bdc8a5c711523a27a7d9e7a84521efeeca8d696423c366a48271419d29a' 
  AND token = 'Q33V7vgbW1SdqEttcJPcz4+1W2K8NqC5OnoZ4Ww4hSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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