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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0ab186d14c40a38b7b1f0baf09247972729e3988c1cac59af3dcd1dd3833c101' 
  AND token = 'PXiHhPQR6OPPXqxdI+4cZ9TqY8EukFW9syCkBmvEp3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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